<?php
Swoole\Runtime::enableCoroutine();
Swoole\Coroutine\run(function () {
    go(function(){
        $i = 9999999999999;
        while($i--){
             file_put_contents("./4.7test", $i.PHP_EOL);
        }
        echo 111;
    });

    go(function(){
        echo 222;
    });
});